to heat; to cook

important, weighty / valuable

importance, weight / value

tight / reliable

stable, fulfilled

be fast, securely in place / be reliable, level-headed / keep going, keep trying

fast (in a firm or secure manner), tightly / surely, unwaveringly, steadily, reliably

to let through, to let pass / to pass through, to cause to move through / to persist in until the end / to make something happen by force

(obsolete) meat / (obsolete) flesh, as of one's body

fever / (physics) heat